Dometic furnace · 2 model lines
Dometic furnace: 3 flashes
Dometic documentation for 2 model lines lists “3 flashes” as “An ignition lockout fault”.
Check your model first. The same code can mean different things on different models. Find the model number on the appliance's data label, then use the matching row below.
What this message means by model
| Model line | What the manufacturer says | Source |
|---|---|---|
| Dometic DFSA / DFSD / DFMD / DFLD / DFLA furnaces | The Dometic DF furnace manual lists 3 flashes with a 3-second pause as an ignition lockout fault. | Dometic DF Series Furnace Installation Manual |
| Dometic Hydro Flame AFM series furnaces | The Dometic Hydro Flame AFM technical installation manual lists 3 flashes with a 3-second pause as an ignition lockout fault. | Dometic Hydro Flame AFM Series Furnaces Technical Installation Manual 32471 |
What you can safely check
- Turn the thermostat off.
- Do not keep cycling the furnace if ignition lockout returns.
Stop and call a technician for
- Ignition, gas, burner, board, and combustion diagnosis is qualified RV furnace service work.
RV furnaces burn LP gas and can create fire, explosion, electrical, burn, and carbon monoxide hazards. Shut the furnace off and do not service burner, board, wiring, gas, or combustion parts unless qualified.
Write this down before you call
- furnace model
- thermostat setting
- LED flash count
- lockout state
Other codes on Dometic DF and Hydro Flame AFM furnaces
Full table: Dometic DF and Hydro Flame AFM furnaces